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A flame arrester operate by removing heat from the flame as it attempts to travel through narrow passages with heat-conductive walls. The arrester will stop a high velocity flame head by absorbing heat from the flame head, which lowers the burning gas/air mixture below its auto-ignition temperature and creating an atmosphere where the flame cannot survive. Channels or passage are designed into the device to conduct heat outward but still allow the gasses to flow. Here is a document to help you apply the correct type for your requirement. Please always consult an applications expert (Belilove Company-Engineers - (510) 274-1990) prior to selection and installation.